... high quality Channel steel with reasonable price. Including Chinese standard, Japanese standard and so on.Material: SS400, ST37-2, A36 ... , S235JRG1, Q235, Q345 etc. Standard: GB/JIS/EN/ASTM/DIN and others. Packing: In ... 50*37*4.5mm -400*104*14.5mm Japanese standard size: 50*25*3mm-300*90*13mm5#---40AB ... Q195-235,SS400,etc. 2.QB, JIS, European standard 3.length is 6m---12m. size (mm)thickness ...